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Electronic Overcurrent Relay

Electronic Overcurrent Relay
Electronic Overcurrent Relay
Product Code : 20
Product Description

Offered Electronic Over Current Relay EOCR LR97D is available either with lug connections or screw clamp with effective external AC power supply and mechanical or manual reset configuration. In addition, our relay offer protection functions because of mechanical or overload jamming, steady and starting state function over torque monitoring and more.

Electronic Over Current Relay EOCR - LR97D

LR97D electronic over current relays have been developed to satisfy machine protection requirements. These relays have definite time characteristics: current threshold and time based function. They are particularly recommended for providing mechanical protection on machines with high resistive torque, high inertia and with strong probability of jamming under steady state conditions. They can be used for motor protection in the case of long starting times or frequent starting. The LR97 D relay also incorporates two fixed time protection functions, one of 0.5 seconds against locked rotor and one of 3 seconds against phase failure. LR97 D and LT47 can be used to provide mechanical shock protection. In this case, setting the 0-Time knob to minimum will ensure tripping in 0.3 seconds.

LR97D relays are particularly suitable for the following types of machines.

  • Monitoring function for excessively long starting time on machines with a risk of difficult starting
  • Machines with high resistive torque, high inertia machines.
  • Monitoring of machines during steady state operation: overtorque detection function
  • Machines with strong risk of jamming, machines with torque build-up over time,
  • Mechanical failure monitoring,
  • Faster detection of malfunctioning on machines where the motor is oversized in relation to its thermal protection Pt.
  • Motor protection for specific applications:
  • Machines with long starting times,
  • Machines with high on-load factor: more than 30 to 50 starts/hour,
  • Machine with fluctuating load from a steady state, where the thermal image of a thermal overload relay (thermal memory) is unsuitable in relation to actual overheating of the motor.

Examples of machines:

  • Conveyors, crushers and mixers,
  • Fans, pumps and compressors,
  • Centrifuges and spin-dryers,
  • Presses, shearing machines, saws, broaching machines, sanders and lifting hoists.

Operation:

  • Because of their two separate time settings, LT47 relays can be combined with the motor-starter function:
  • D-Time: starting time, 0-Time: trip time during steady state.
  • The D-Time function is only available during the motor starting phase. During this phase the overload detection function is inhibited in order to allow starting. Under steady state conditions, when the motor current is greater than the setting current due to an overload or single-phasing, the red LED lights up and the internal relay switches its contact after a time preset by the 0-Time knob.
  • The red LED stays on, indicating that the relay has tripped.

The relays are simple to set, in 5 easy steps:

  • Adjust the 3 knobs to maximum (Load, D-Time and 0-Time),
  • Adjust the D-Time knob to the value corresponding to the motor starting time.
  • When the motor reaches steady state, adjust the Load knob (turn the knob counter-clockwise until the red LED starts to flicker).
  • Slowly turn the Load knob clockwise until the LED goes out.
  • Set the required tripping time, using the 0-Time knob.

Technical Specifications: 

Relay setting range

Usable range (1)

For use with contactor (2)

Relay supply voltage

Reference

Weight

A

A




Kg

0.3...1.5

0.3...1.3

LC1 D09…D38

a 200…240 V

LR97 D015M7

0.172

a 100…120 V

LR97 D015F7

0.172

c/a 24 V

LR97 D015B

0.172

c/a 48 V

LR97 D015E

0.172

1.2…7

1.2…6

LC1 D09…D38

a 200…240 V

LR97 D07M7

0.172

a 100…120 V

LR97 D07F7

0.172

c/a 24 V

LR97 D07B

0.172

c/a 48 V

LR97 D07E

0.172

5…25

5…21

LC1 D09…D38

a 200…240 V

LR97 D25M7

0.172

a 100…120 V

LR97 D25F7

0.172

c/a 24 V

LR97 D25B

0.172

c/a 48 V

LR97 D25E

0.172

20…38

20…34

LC1 D25…D38

a 200…240 V

LR97 D38M7

0.172

a 100…120 V

LR97 D38F7

0.172

c/a 24 V

LR97 D38B

0.172


Relay setting range

Usable range (1)

For use with contactor (2)

Relay supply voltage

Reference

Weight

A

A




Kg

0.5…6

0.5…5

LC1 D09…D38

a 200…240 V

LT49 06M9S

0.192

a 100…120 V

LT49 06F9S

0.192

c/a 24 V

LT49 06BS

0.192

c/a 48 V

LT49 06ES

0.192

3…30

3…25

LC1 D09…D38

a 200…240 V

LT49 30M9S

0.192

a 100…120 V

LT49 30F9S

0.192

c/a 24 V

LT49 30F9S

0.192

c/a 48 V

LT49 30ES

0.192

5…60

5…60

LC1 D09…D38

a 200…240 V

LT49 60M9S

0.192

a 100…120 V

LT49 60M9S

0.192

c/a 24 V

LR99 D25B

0.192

c/a 48 V

LT49 60ES

0.192

 LT47 relay with automatic reset

0.5…6

0.5…5

a 200…240 V

LT47 06M7A

0.192

a 100…120 V

LT47 06F7A

0.192

c/a 24 V

LT47 06BA

0.192

c/a 48 V

LT47 06BA

0.192

3…30

3…25

a 200…240 V

LT47 30M7A

0.192

a 100…120 V

LT47 30F7A

0.192

c/a 24 V

LT47 30F7A

0.192

c/a 48 V

LT47 30F7A

0.192

5…60

5…60

a 200…240 V

LT47 60M7A

0.192

a 100…120 V

LT47 60F7A

0.192

c/a 24 V

LT47 60BA

0.192

c/a 48 V

LT47 60ES

0.192

Offered Electronic Over Current Relay EOCR LR97D is available either with lug connections or screw clamp with effective external AC power supply and mechanical or manual reset configuration. In addition, our relay offer protection functions because of mechanical or overload jamming, steady and starting state function over torque monitoring and more.

Electronic Over Current Relay EOCR - LR97D

LR97D electronic over current relays have been developed to satisfy machine protection requirements. These relays have definite time characteristics: current threshold and time based function. They are particularly recommended for providing mechanical protection on machines with high resistive torque, high inertia and with strong probability of jamming under steady state conditions. They can be used for motor protection in the case of long starting times or frequent starting. The LR97 D relay also incorporates two fixed time protection functions, one of 0.5 seconds against locked rotor and one of 3 seconds against phase failure. LR97 D and LT47 can be used to provide mechanical shock protection. In this case, setting the 0-Time knob to minimum will ensure tripping in 0.3 seconds.

LR97D relays are particularly suitable for the following types of machines.

  • Monitoring function for excessively long starting time on machines with a risk of difficult starting
  • Machines with high resistive torque, high inertia machines.
  • Monitoring of machines during steady state operation: overtorque detection function
  • Machines with strong risk of jamming, machines with torque build-up over time,
  • Mechanical failure monitoring,
  • Faster detection of malfunctioning on machines where the motor is oversized in relation to its thermal protection Pt.
  • Motor protection for specific applications:
  • Machines with long starting times,
  • Machines with high on-load factor: more than 30 to 50 starts/hour,
  • Machine with fluctuating load from a steady state, where the thermal image of a thermal overload relay (thermal memory) is unsuitable in relation to actual overheating of the motor.

Examples of machines:

  • Conveyors, crushers and mixers,
  • Fans, pumps and compressors,
  • Centrifuges and spin-dryers,
  • Presses, shearing machines, saws, broaching machines, sanders and lifting hoists.

Operation:

  • Because of their two separate time settings, LT47 relays can be combined with the motor-starter function:
  • D-Time: starting time, 0-Time: trip time during steady state.
  • The D-Time function is only available during the motor starting phase. During this phase the overload detection function is inhibited in order to allow starting. Under steady state conditions, when the motor current is greater than the setting current due to an overload or single-phasing, the red LED lights up and the internal relay switches its contact after a time preset by the 0-Time knob.
  • The red LED stays on, indicating that the relay has tripped.

The relays are simple to set, in 5 easy steps:

  • Adjust the 3 knobs to maximum (Load, D-Time and 0-Time),
  • Adjust the D-Time knob to the value corresponding to the motor starting time.
  • When the motor reaches steady state, adjust the Load knob (turn the knob counter-clockwise until the red LED starts to flicker).
  • Slowly turn the Load knob clockwise until the LED goes out.
  • Set the required tripping time, using the 0-Time knob.

Technical Specifications: 

Relay setting range

Usable range (1)

For use with contactor (2)

Relay supply voltage

Reference

Weight

A

A




Kg

0.3...1.5

0.3...1.3

LC1 D09…D38

a 200…240 V

LR97 D015M7

0.172

a 100…120 V

LR97 D015F7

0.172

c/a 24 V

LR97 D015B

0.172

c/a 48 V

LR97 D015E

0.172

1.2…7

1.2…6

LC1 D09…D38

a 200…240 V

LR97 D07M7

0.172

a 100…120 V

LR97 D07F7

0.172

c/a 24 V

LR97 D07B

0.172

c/a 48 V

LR97 D07E

0.172

5…25

5…21

LC1 D09…D38

a 200…240 V

LR97 D25M7

0.172

a 100…120 V

LR97 D25F7

0.172

c/a 24 V

LR97 D25B

0.172

c/a 48 V

LR97 D25E

0.172

20…38

20…34

LC1 D25…D38

a 200…240 V

LR97 D38M7

0.172

a 100…120 V

LR97 D38F7

0.172

c/a 24 V

LR97 D38B

0.172


Relay setting range

Usable range (1)

For use with contactor (2)

Relay supply voltage

Reference

Weight

A

A




Kg

0.5…6

0.5…5

LC1 D09…D38

a 200…240 V

LT49 06M9S

0.192

a 100…120 V

LT49 06F9S

0.192

c/a 24 V

LT49 06BS

0.192

c/a 48 V

LT49 06ES

0.192

3…30

3…25

LC1 D09…D38

a 200…240 V

LT49 30M9S

0.192

a 100…120 V

LT49 30F9S

0.192

c/a 24 V

LT49 30F9S

0.192

c/a 48 V

LT49 30ES

0.192

5…60

5…60

LC1 D09…D38

a 200…240 V

LT49 60M9S

0.192

a 100…120 V

LT49 60M9S

0.192

c/a 24 V

LR99 D25B

0.192

c/a 48 V

LT49 60ES

0.192

 LT47 relay with automatic reset

0.5…6

0.5…5

a 200…240 V

LT47 06M7A

0.192

a 100…120 V

LT47 06F7A

0.192

c/a 24 V

LT47 06BA

0.192

c/a 48 V

LT47 06BA

0.192

3…30

3…25

a 200…240 V

LT47 30M7A

0.192

a 100…120 V

LT47 30F7A

0.192

c/a 24 V

LT47 30F7A

0.192

c/a 48 V

LT47 30F7A

0.192

5…60

5…60

a 200…240 V

LT47 60M7A

0.192

a 100…120 V

LT47 60F7A

0.192

c/a 24 V

LT47 60BA

0.192

c/a 48 V

LT47 60ES

0.192

Contact Us

Fangdouyan Industrial Zone, Liusi, Yueqing, Wenzhou, Zhejiang, China